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A block B, of mass 
, lies on a rough inclined plane sloping at 
to the horizontal. A light rope, inclined at an angle of 
above a line of greatest slope, is attached to B. The tension in the rope is 
. There is a friction force of 
acting on B (see diagram). The coefficient of friction between B and the plane is 
. It is given that 
and that the acceleration of B up the plane is 
. Find the value of 
and the value of .
